Write an Arduino program to design a password lock that has four users. The password should be at least $6$ digits long. Use a $4$x$4$ matrix keypad to take input. Use the keypad's A$,$ B$,$ C$,$ and D keys to determine users one to four. Store all the user passwords in EPROM so that if Arduino is unplugged, the password remains in non$-$volatile storage. The DOT matrix displays the selected user while the program takes the password. Once login is successful, display the word $$Welcome$.$ You can use a scrolling effect to accommodate the word or show them one character at a time. On login failure, you should flash $$X$$ on the dot matrix display.

Your code should also display the login status and all the steps in the serial monitor. Upon successful login$,$ display a meaningful message on the serial monitor.

Use # as enter to confirm login$.$ Use $*$ to start the program again.